Astronomy and Astrophysics Supplement Series

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CONTENTS

ASTRONOMY AND ASTROPHYSICS Supplement Series, Vol. 123, May II 1997

Four colour photometry of late-type binary systems. I. First light curves of ZZ Ursae Majoris
R. Clement, M. García, V. Reglero, J.V. Clausen, A. Bravo, J. Suso, J. Fabregat, J.M. Torrejón, P. Reig, and A. Marco

An Atlas of the infrared spectral region. II. The late-type stars (G - M)
J.M. Carquillat, C. Jaschek, M. Jaschek, and N. Ginestet

Optical positions and proper motions of radio stars
P.Z. Lu and T.Q. Xu

Photoelectric photometry of the open cluster NGC 2422
E. Rojo Arellano, J.H. Peña, and D. González

Cold neutral gas associated with the Gum nebula
E.M. Reynoso and G.M. Dubner

WSRT HI synthesis absorption study towards Cassiopeia A
U.J. Schwarz, W.M. Goss, and P.M.W. Kalberla

Four colour photometry of late-type binary systems. II. New light curves of BH Virginis
R. Clement, M. Garcia, V. Reglero, J.V. Clausen, A. Bravo, J. Suso, and J. Fabregat

A multiwavelength study of star formation in the very young open cluster NGC 6530
M.E. van den Ancker, P.S. Thé, A. Feinstein, R.A. Vázquez, D. de Winter and M.R. Pérez

An analysis of the currently available calibrations in Strömgren photometry by using open clusters
C. Jordi, E. Masana, F. Figueras and J. Torra

A consolidated catalogue of Bootis stars
E. Paunzen, W.W. Weiss, U. Heiter, and P. North

Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. II. The optical observations
F.-J. Zickgraf, I. Thiering, J. Krautter, I. Appenzeller, R. Kneer, W.H. Voges, B. Ziegler, C. Chavarria, A. Serrano, R. Mujica, M. Pakull, and J. Heidt

Field #3 of the Palomar-Groningen Survey. I. Variable stars in the outer edge of the Sagittarius dwarf galaxy
Y.K. Ng and M. Schultheis

The supercluster-void network. I. The supercluster catalogue and large-scale distribution
M. Einasto, E. Tago, J. Jaaniste, J. Einasto, and H. Andernach

Spectral classifications in the near infrared of stars with composite spectra. II. Study of a sample of 180 stars
N. Ginestet, J.M. Carquillat, C. Jaschek and M. Jaschek

Atomic and molecular data

Orthogonal operator calculation of E1, M1 and E2 transition probabilities in Ti III and V IV
A.J.J. Raassen and P.H.M. Uylings

Atomic data from the IRON Project. XXII. Radiative rates for forbidden transitions within the ground configuration of ions in the carbon and oxygen isoelectronic sequences
M.E. Galavís, C. Mendoza, and C.J. Zeippen

Instruments and observational techniques

An attempt to detect polarization effects in the envelope of Cassiopeiae with the GI2T interferometer
K. Rousselet-Perraut, F. Vakili, D. Mourard, F. Morand, D. Bonneau, and Ph. Stee

Optical materials for near infrared Wollaston prisms
E. Oliva, S. Gennari, L. Vanzi, A. Caruso, and M. Ciofini

Data processing

CLEAN and WIPE
A. Lannes, E. Anterrieu, and P. Maréchal